Air-pump for pneumatic tires



E. R. BUCHANAN.

AIR PUMP FOR PNEUMATIC TIRES.

APPLICATION FILED MAR. 23. |918.

Patented Sept.l 16, 1919.

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T EDWARD R. BUCHANAN, or PADUQAH, KENTUCKY.

AIR-PUMP Foa PNEIVIA'rIol 1 v Specification of Letters Patent. Patentedsept. 16V, 1919.

Application led March 23, 1918. Serial No. 224,111.

To all whom it may concern:

Be it known that I, EDWARD R. BUCH- ANAN, a citizen ofthe United States, residing at Paducah, in the county of McCracken and State of Kentucky, have invented new and useful Improvements in Air-Pumps for Pneumatic Tires, of which the following is a specification.. y

This invention relates .to improvementsv in air pumps for use in inflating pneumatic tires and for other analogous uses, one 0bject of the invention being to provide an improved pump of this character which is double acting, is simple in construction, is strong and durable, and which is not likely to get out of order.

Another object of the invention is to provide an improved air pump embodying novel features of construction which enable two large leather washers to be used which prevent leakage of air and which are extremely durable, so that the air pump can be readily maintained in highly efficient operating condition and requires but very little attention.

Vith the above and other objects in view the invention consists in the construction,'

combination and arrangement 'of devices hereinafter described and claimed.

In the accompanying drawing Figure 1 is a vertical sectional view of an air pump constructed and arranged in aocordance with my invention; Y

Fig. 2 is a detailed sectional view, on a larger scale, of the upper portion of the Pump;

Fig. 3 is a similar` view of the lower tion or the pump.

Fig. 4 is a transverse sectional view on the plane indicated by the line 4.--4 of Fig. 1.

My improved air pump comprises an outer cylinder 1 and an inner cylinder V2. The exterior diameter of the inner cylinder is less than the interior diameter of the outer cylinder, so that an annular space is formed between said cylinders. The lower end ofA the outer cylinder is screwed or otherwise suitably secured in the annular upstanding llange 3 of a suitable base 4. A sleeve 5 is screwed on the upper end of the outer cylinder and is provided at its upper end with an outwardly extending annular flange 6. The bore of the sleeve is iared in its upper portion as at 7.

A plug 8 is secured in the upper end of the inner cylinder and is provided with an opening 9 to admit air to the interior of the inner porcylinder. A handle l0, which is preferably made of wood, has its central portion secured on the upper end of the plug by'means `of a suitable bolt 11. A' closure 12 is screwed or otherwise secured in the lower end of the inner cylinder-'2 and has a central threaded opening in which a screw plug 13 is screwed. The said screw plug has a vcentral vertical bore v14'which has anenl'arged upperlcounterbored portion 15 and an enlarged "lower counter-bored portion 16.y Avalve 17 is arranged in the lower counter-bored portion 16 and :has an upwardly extending centrally arranged valve stem 18 at the upper end of which is astop disk 19. A coiled eXtensile spring 20 is arranged in the upper counterbored portion 15 of the bore of the valve plug and has its lower Vend bearing on the shoulder 21 and its upper end'bearing under the stopdisk, the function of said spring being to normally close the valve 17 upwardly against the valve seat 22 of the valve'plug. A heavy leather washer 23 is arranged on the underside of the closure 12 and is upturned around its edge to bear agains'tthe wall of the outer cylinder l. A guide washer or follower 24 bears against the underside of the washer 23 and is held in place bya nut 25 which is screwed to the threaded lower endof the valve plug as shown'.

A cap 26 is secured on the upper end .of the outer cylinder by means of a suitable number of cap screws 27. A heavy leather washer 28 is secured between the cap andthe sleeve 6 and has its inner portion turned downwardly to `form van ani'ilar'an'ge'29 which is arranged in the flared portion 7 of l the sleeve and bears against and tightly and closely around the inner cylinder. The sleeve has a hose connection 30 and also has a ball check valve 31 which is held in place by a screw plug 32 as shown. The cap 26 has an annular chamber 33 in its inner side and which extends around the inner cylinder. A felt ring or washer or other suitable packing element 34 is arranged in said annular chamber and forms a packing varound the inner cylinder to wipe and lubricate the same. The cap also has an opening '35 which leads to the chamber 33 and which enables oil or other suitable lubricant to be supplied to the packing 34.

It will be understood that from the foregoing description and by reference to the drawing that by my construction of the parts of the air pump l am enabled to use the two heavy leather washers 23 and 28. These washers are extremely durable so that the pump is maintained at the maximum efliciency for an indefinite length o f time and requires practically no attention in order to keep the same in operative condition.

At each upstroke of the inner cylinder, the air between the Same and the outer cylinder is compressed and forced out past the check valve 31 in the sleeve to the hose which is connected to the sleeve at 30. At the same time air enters the inner cylindervand the lower portion of the outer cylinder through the opening 9 in the plug 8 and through the bore 14 of the valve plug 13, and past the valve 16,1said valve opening downwardly against the resistance of the spring 20 as will be understood. On each down stroke of the inner cylinder the valve 16 closes and air is compressed between the lower end of the inner cylinder and the lower portion of the outer cylinder and is forced upwardly, past the washer 28 and through the annular space between the inner and outer'cylinders and out through the hose connection 6.

lVhile I have herein shown and described a preferred form of my invention I would have it understood that changes may be made in the form, proportion and construction of the several parts without departing from the spirit of my invention and within the scope of the appended claims.

Having thus described the invention what is -claimed is:

1. An air pump comprising a base, an outercylinder secured thereto, a sleeve secured to the cylinder, said sleeve having the outer portion of its bore flared and formed at its outer end with an outstanding flange, said sleeve being further provided with a valved outlet port, regulating means for the valve in the port, a cap having a packing chamber therein received over the flange, a heavy washer resting between the cap and the flange, means securing the flange and cap passing through the washer for sustaining the same in the cylinder, and the inner end of the said washer designed to be received in the flared portion of the sleeve, a reciprocatory cylinder in the first mentioned cylinder having its lower end provided with an outwardly opening spring influenced valve and carrying at its lower end a leather washer cupped to engage with the first mentioned cylinder, said last mentioned cylinder having its outer end closed by a plug that is provided with an air inlet opening, and a handle secured to the plug.

2. In an air pump, the combination with two cylinders one reciprocatory in the other, the inner cylinder having at its outer end a handle and an air inlet opening and at its lower end a normally closed valve and a dished washer that contacts with the outer cylinder, a base for the outer cylinder, a sleeve secured to the outer end of the outer cylinder, said sleeve having its bore at the outer portion thereof 'flared and being flanged outwardly at its said outer end, a valve controlled outlet port in the sleeve, a cup-shaped leather washer resting on the flange and having Vits inner portion received in the flared bore of the cap and contacting with the outer periphery of the inner cylinder, a cap member resting on the washer, said cap member having an annular depres- -sion in the bore thereof designed to receive a packing and having an opening communieating with the said depression, and ele-V ments passing through the cap, last mentioned washer and flange of the sleeve for securing the cap and washer on the sleeve.

In testimony whereof I afliX my signature.

ED. R. BUCHANAN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

